Pi is a mathematical constant that is the ratio of a circle's circumference to its diameter, and it is also one of the most revered mathematical constants in the known world. Pi Day was first officially celebrated on a large scale in 1988 at the San Francisco Exploratorium. Math lovers unite! Celebrate Pi Day with Pi foods, some Pi crafts, and a contest to see who has the most digits of Pi memorized.

Pi is a mathematical constant that is the ratio of a circle's circumference to its diameter, and it is also one of the most revered mathematical constants in the known world. Pi Day was first officially celebrated on a large scale in 1988 at the San Francisco Exploratorium. Math lovers unite! Celebrate Pi Day with Pi foods, some Pi crafts, and a contest to see who has the most digits of Pi memorized.